Hollow blast-grate.



No 824,716. PATENTED JULY 3, 1906.

E. J. GORDON.

HOLLOW "BLAST GRATE.

APPLICATION FILED 00T.23.1905.

2 SHEETS-SHEET 1.

. .WITNESSESi M INVENTOR .Q. E 0 Y i THE mmms PETERS cm, wAsHnvcroN, D. c

No. 824,716. PATENTED JULY 3, 1906.

B.J.GORDON. HOLLOW BLAST GRATE.

APPLICATION FILED 0UT.23. 1905.

2 SHEETS-SHEET 2;

WlT NESSES: INVENTOR Q/w ATTORNEY UNITED STATES PATENT OFFICE.-

HOLLOW BLAST-GRATE.

Specification of Letters Patent.

Patented July 3, 1906.

Application filed October 23, 1905. Serial No. 284,090-

To all whom, it may concern:

Be it known that I, ELoNso J. GORDON, a citizen of the United States, residing at Big Rapids, in the county of Mecosta and State of Michigan, have invented certain new and useful Improvements in Hollow Blast- Grates; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to hollow grate-bars for furnaces, and more particularly to those furnaces adapted to consume fine fuel, as sawdust, the object being to provide a simple yet highly efficient device of this character which is inexpensive to manufacture.

Another object is the provision of a gratebar the upper surface of which is so inclined and perforated that the jets of air fed through the perforations are directed away from the adjacent edges of the bar to prevent the liability of escape of the air, the jets of air adapted to converge toward and intersect one another to more widely diffuse the air and assist the combustion of the fuel.

To these ends my invention consists in certain novel features and combinations of parts or their equivalents, such as will be more fully described hereinafter and particularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a perspective view of a furnace-grate provided with my improved grate-bar. Fig. 2 is a perspective view of one of the grate-bars, and Fig. 3 is a view in vertical cross-section on line a: :20 of Fig. 2, and Fig. 4 is a side view.

A indicates a grate-bar approximately rectilinear in cross-section, as shown, and being reduced at its ends, as at 1 1, to rest securely upon the subwall and form firm supports for the body portion of the bars. The upper face 2 of the bar is recessed to form longitudinal rooves having the diverging faces 3 3, whic are apertured, as at 4 4, the apertures on one inclined face being preferably arranged in staggered relation to the apertures on the opposing face, whereby the air is more fully difiused through the combustible material. Each bar preferably is provided with at least two unobstructed grooves having diverging faces, the apertures of which faces communicate with the hollow interior of the bar, the air or other gas being led into the bar through the inlet connections and normally discharging through the apertures in the upper face of the bar.

In Fig. 1 I have shown my improved form of bar as combined with grate-bars having a flat upper face provided with elongated perforations, such grate-b ars being more particularly designed for burning sawdust and capable of being arranged alternately with the grate-bars heretofore described.

It is further to be noted that the jets of air do not impinge directly against the boiler, but

are adapted to lose their force before reaching the latter, whereby to prevent its burning out. Also the two outer series of apertures are inclined away from the adjacent edges of the grate-bar, thus preventing the escape of air between the bars. The absence of obstructions on the faces of the bars admits of their easy cleaning.

Having thus fully described my invention, what I claim as new is l. The combination in a furnace having subwalls, of a grate-bar comprising a body portion hollow from end to end, and approximately rectangular in cross section, the grate-bar being reduced or undercut at its opposite ends, the lower surfaces of the hollow reduced ends bein fiat to rest upon the subwalls, the thickene I central portion of the bar being provided with an air-inlet and an outlet for the air, the upper face of the bar being provided with a series of parallel unobstructed grooves extending from end to end of the bar and of the reduced portion thereof, the walls of which grooves are laterally inclined and apertured relative to each other, the direction of inclination of the apertures nearest the longitudinal edges of the bar being away from said edges, and a central unperforated flat portion lying between each 5 two longitudinal grooves, the upper surface of the bar being unreduced.

2. The combination with a furnace, of a grate-bar comprising a hollow body portion, the ends of which are reduced from beneath, or undercut, to rest on the furnace-walls, the upper face of thebar being provided with a plurality of parallel grooves, all lyin in the same horizontal plane, the walls of w 'ch diverge relative to each other, and are provided with rows of'apertures staggered with relation to the apertures on the opposing wall of the groove.

3. The combination in a furnace with suitable walls, of a grate-bar, comprising ahollow body portion reduced or undercut at its ends, unperforated portion lying between each two the reduced ends adapted to rest upon the grooves.

walls, the upper face of the bar provided with In testimony whereof I affix my signature a series of parallel unobstructed grooves all in presence of two witnesses.

lying in the same horizontal plane, the walls ELONSO J GORDON. of the grooves converging toward the bottom Witnesses: and provided with a plurality of apertures E. J. SEALEY,

staggered relative to each other, and a central J. H. KILBOURNE. 

